Boiler furnace



March 31. 192s.

v 1,531,673 H. J. s. MacKAY BOILER FURNACE Filed Aug, 21, i920 2sheets-sheet l March 31. 1525. 1,531,673

H. J. S. MaCKAY BOILER FURNAGE Filed Aug. :21,v 1920 2 sheets-sheet 2.IN VEN TGR. MAW d waa/a7 BY w( .1 @ma ATTORNEYS.

Patented Manl, 1925,.. y

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HENRY J". yS. MACKAY, OF HYDE, ISLE OF WIGHT, ENGLAND, ASSIGNOR TQ THEBAB- COKCK s WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATON 0FNH'` JERSEY.

v BOILER FURNACE.

To all whom it may concern.'

Be it known that I, HENRY J. S. MACKAY, a subject of the King of GreatBritain, residing at Rosemount, Bellevue Road, Hyde, lsle of Wight, inthe county of Hampshire, England, have invented certain new and usefulImprovements in Boiler Furnaces, of which the followingv is aspecification.

This invention relates to boiler furnaces and has for its object toprovide an improved construction and arangement of such furnacesparticularly adapted for usc Afor burning wood, megass and like fuel.

@ne of the objects of the invention is to provide a sloping grate onwhich the fuel may be dried and partly consumed and a horizontal grateon which the combustion may be completed, under forced draft, ifdesired. l

Another object of the invention is to provide a roof over such gratesdesigned so that the heat from the point of complete combustion may bereflected and radiate to the fuel on the slopin grate to drive olfexcess moisture from suc fuel. l f

Another object of the invention is to provide such a furnace with acharging hopperl arranged so that the entrance of air to the furnace,while charging it, is prevented. With these and other obects in view, myinvention camprises the arrangement hereinafter described and pointedout in the appended claims.I

The invention is illustrated in the accompanving drawings in whichFigure l is a sectional elevation of a boiler furnace constructed inaccordance with the invention;

Fig.' 2 is a plan View, partially broken away of the furnace and settingof Fig. l, and Fig. 3 is a section taken along the plane of the line 3-3of Fig. 1.

In the illustrated form, the furnace'is provided near its upper end witha charging hopper a consisting of a wrought iron or steel chute with atop cover b connected by means of'a wire rope or the like with aguillotine door c located in the furnace end of the hopper in suchmanner that the guillotine door closes at the moment the coverof the'hopper is opened to charge the same with fueland no air can be admittedtothe furnace. Beyond the guillotine door within the furnace is disposeda sloping grate. d which,- in the form illustrated, is provided withsteps. On this grate `the fuel moves by gravity, being dried and partlyconsumed in its downward path. ln my preferred form, at the lower end ofthe step grate d' are disposed blast bars e formed with a plurality ofopenings B on-their upper surfaces and connected by air pipes f, f,supplied with air under pressure by a fan (not shown) located outsidethe furnace. Preferably intermediate these blast bars are disposed aseries of movable grate bars, which, in the illustrative form, arerocking bars g adapted to rock on pivots h and operable by means of armssi and a connected link y' extending outside the furnace by a handle 7a.Above the step grate d is located a sloping arch Z which projects intothe main lcombustion chamber of the boiler, and for this reason iscapable of radiating sufcient heat to drive off superfluous moisturefrom the fuel passing over 'the step grate.

The lower portion of the furnace consisting of the movable bars forminga horizontal grate located adjacent to the bridge wall as illustrated,and forced draught bars serves to deal with the charcoal formed in thefurnace due to the formation of fine ash around the wood fuel, whichfine ash prevents the necessary oxygen lfor combustion coming intocontact with the wood or the like to be burned. By means of the movablebars, the mixture of carbon and ash is agitated so as to free thesurface of the carbon and by means of the forced draught bars,

the necessary amount of oxygen is 'provid-v ed to vensure perfectcombustion.

What claim and desire to secure by Letters Patent of the United Statesis l. In a boiler furnace for burning wood,l

rnegasse and the like, a sloping grate, a horizontal grate havingmovable parts and located at the lower end of the sloping grate andarranged to receive fuel therefrom, pipes leading from the front of thefurnace for supplying forced draft to the horizontal grate only, and asloping roof extending over both the sloping and the horizontal gratesfor directing the radiated heat from the fuel bed on the horizontalgrate against the fuel bed on the sloping grate.

2. In a furnace for burning Wood, megasse and the like, a sloping grate,a horizontal grate at the lower end of the sloping grate and arrangedIto receive fuel therefrom,

pipes leading from the front of the furnace n for supplying forced draftto the horizontal grate only, and a sloping roof arranged to provide achamber increasing in height from the front to the rear of the furnaceand eX` tending over both the sloping and the horizontal grates fordirecting the radiated heat from the fuel bed on the horizontal grateagainst the fuel bed on the sloping grate, the horizontal gratecomprising stationary forced blast bars and rocking bars, whereby theAfuel on the horizontal grate is kept free of ash from the fuel and airis supplied to the fuel to complete combustion thereof.

3. In a furnace for burning wood, megasse and the like, a bridge wall, asloping grate, a horizontal grate located adjacent the said bridge wallat the lower end of the sloping grate and arranged to receive fueltherefrom.; pipes leading from the front of the furnace for supplyingforced draft to the horizontal grate only, and a sloping roof arrangedto provide a chamber increasing in height from the front to the rear ofthe furnace and extending over both the sloping and the horizontalgrates for 'directing the radiated heat from the fuel bed on thehorizontal grate against the fuel I bed on the sloping grate, thehorizontal gra-te comprising stationary forced blast bars and rockingbars, whereby the fuel onv the horizontal grate is kept free of ash fromthe fuel and air is supplied to the fuel to complete combustion thereof.

4. yIn a furnace for burning Wood, rnegasse and the like, a bridge Wall,a stationary sloping grate, a horizontal grate located adjacent the saidbridge Wall at the lower end of v.ing the radiated heat from the fuelbed on the horizontal grate against the fuel bed on thesloping grate7the horizontal grate comprising stationary forced blast bars and rockingbars, whereby the fuel on the horizontal grate is kept free of ash fromthe fuel and air is supplied to the fuel to complete combustion thereof.

al1 Si MACKAY.

